Download App

11. Dual nature of radiation and matter — Physics STD 12 Science — Question

CBSE BoardEnglish MediumSTD 12 SciencePhysics11. Dual nature of radiation and matter1 Mark
MCQ
The figure shows a plot of photo current versus anode potential for a photo sensitive surface for three different radiations. Which one of the following is a correct statement?
  • A
    Curves $(b)$ and $(c)$ represent incident radiations same frequencies having same intensity.
  • ✓
    Curves $(a)$ and $(b)$ represent incident radiations of same frequencies but of different intensities
  • C
    Curves $(a)$ and $(b)$ represent incident radiations of different frequencies and different intensities
  • D
    Curves $(b)$ and $(c)$ represent incident radiations of different frequencies and different intensities
✓

Answer

Correct option: B.
Curves $(a)$ and $(b)$ represent incident radiations of same frequencies but of different intensities
b
Here $D_1$ is in forward bias and $D_2$ is in reverse bias so, $D_1$ will conduct and $D_2$ will not conduct. Thus, no current will flow through $DC$.

$I = \frac{V}{R} = \frac{5}{{10}} = \frac{1}{2}\,A$

Need a full question paper?

Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.

Start Generating Free

Explore more

More "M.C.Q (1 Marks)" from 11. Dual nature of radiation and matter→11. Dual nature of radiation and matter — all question types→Physics STD 12 Science question papers→CBSE Board STD 12 Science question papers→CBSE Board question paper generator→

Similar questions

All the particles of a body are situated at a distance R from the origin. The distance of the centre of mass of the body from the origin is:
→
The magnetic induction at the centre $O$ of the current carrying bent wire shown in the adjoining figure is
→
The given transistor operates in saturation region then what should the be value of $V _{ BB }$ (in $Volt$)

$( R _{\text {out }}=200 \Omega, R _{\text {in }}=100 k \Omega,$$ V _{ cC }=3 volt , V _{ BE }=0.7 volt ,V _{ GE }=0, \beta=200 )$

→
An electric dipole has the magnitude of its charge as $q$ and its dipole moment is $p$. It is placed in a uniform electric field $E$. If its dipole moment is along the direction of the field, the force on it and its potential energy are respectively
→
Two lithium nuclei in a lithium vapour at room temperature do not combine to form a carbon nucleus because:
→
Three resistors each of $2\, ohm$ are connected together in a triangular shape. The resistance between any two vertices will be
→
Radio wave diffract around building although light waves do not. The reason is that radio waves
→
A star moves away from earth at speed 0.8 c while emitting light of frequency $6 \times 10^{14} \mathrm{~Hz}$. What frequency will be observed on the earth (in units of $10^{14} \mathrm{~Hz}$) (c = speed of light)
→
A potentiometer is an accurate and versatile device to make electrical measurements of $EMF$ because the method involves 
→
Circular part in the centre of retina is called
→